usr/src/sys/tahoe/include/param.h

/*      param.h 1.6     87/01/16        */

/*
 * Machine dependent constants for TAHOE.
 */

#ifndef ENDIAN
/*
 * Definitions for byte order,
 * according to byte significance from low address to high.
 */
#define LITTLE  1234            /* least-significant byte first (vax) */
#define BIG     4321            /* most-significant byte first */
#define PDP     3412            /* LSB first in word, MSW first in long (pdp) */
#define ENDIAN  BIG             /* byte order on tahoe */

/*
 * Macros for network/external number representation conversion.
 */
#if ENDIAN == BIG && !defined(lint)
#define ntohl(x)        (x)
#define ntohs(x)        (x)
#define htonl(x)        (x)
#define htons(x)        (x)
#else
u_short ntohs(), htons();
u_long  ntohl(), htonl();
#endif

#define NBPG            1024            /* bytes/page */
#define PGOFSET         (NBPG-1)        /* byte offset into page */
#define PGSHIFT         10              /* LOG2(NBPG) */
#define NPTEPG          (NBPG/(sizeof (struct pte)))

#define DEV_BSIZE       1024
#define DEV_BSHIFT      10              /* log2(DEV_BSIZE) */
#define BLKDEV_IOSIZE   1024            /* NBPG for physical controllers */

#define CLSIZE          1
#define CLSIZELOG2      0

#define SSIZE           2               /* initial stack size/NBPG */
#define SINCR           2               /* increment of stack/NBPG */
#define UPAGES          6               /* pages of u-area (2 stack pages) */

#define MAXCKEY 255             /* maximal allowed code key */
#define MAXDKEY 255             /* maximal allowed data key */
#define NCKEY   (MAXCKEY+1)     /* # code keys, including 0 (reserved) */
#define NDKEY   (MAXDKEY+1)     /* # data keys, including 0 (reserved) */

/*
 * Some macros for units conversion
 */
/* Core clicks (1024 bytes) to segments and vice versa */
#define ctos(x) (x)
#define stoc(x) (x)

/* Core clicks (1024 bytes) to disk blocks */
#define ctod(x) (x)
#define dtoc(x) (x)
#define dtob(x) ((x)<<PGSHIFT)

/* clicks to bytes */
#define ctob(x) ((x)<<PGSHIFT)

/* bytes to clicks */
#define btoc(x) ((((unsigned)(x)+NBPG-1) >> PGSHIFT))

#define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
        ((unsigned)(bytes) >> DEV_BSHIFT)
#define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
        ((unsigned)(db) << DEV_BSHIFT)

/*
 * Map a ``block device block'' to a file system block.
 * This should be device dependent, and will be if we
 * add an entry to cdevsw/bdevsw for that purpose.
 * For now though just use DEV_BSIZE.
 */
#define bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))

/*
 * Macros to decode processor status word.
 */
#define USERMODE(ps)    (((ps) & PSL_CURMOD) == PSL_CURMOD)
#define BASEPRI(ps)     (((ps) & PSL_IPL) == 0)

#define DELAY(n)        { register int N = 3*(n); while (--N > 0); }
#endif